Search results for "classical"

Hellēņu dimensija Eiropai : Rīgas 1. starptautiskās hellēnistikas konferences "Hellēņu pasaule un mēs" materiāli

2003

Do Financial Crises Moderate Entrepreneurial Recipes? A Comparative Fuzzy Analysis

2016

ABSTRACTThis study performs a fuzzy set qualitative comparative analysis (fsQCA) on entrepreneurial recipes. The research focuses on the moderating role of the 2007 financial crisis on the antecedents of entrepreneurship. Standard regressions analysis proves insufficient to uncover asymmetrical and complex relationships that explain the effect of credit constraints on new business. Empirical results on longitudinal data suggest that the crisis moderated entrepreneurial recipes in Spain. This research contributes to QCA analysis by studying moderation effects on time-series data.

Introduction: The Challenges of Defining and Studying Contemporary Entrepreneurship

2011

Entrepreneurship is a broad and complex concept, and is an important contributor to the economic prospects of companies, sectors, and entire nations. To a casual observer, entrepreneurship is most closely associated with smalland medium-sized enterprises, yet it plays a vital role, either directly or indirectly, in the sustainability of organizations of all sizes and types, private or public, national or multinational. The entrepreneur and the entrepreneurial process are critical to creating new economic activity—boosting innovation, wealth, growth, and employment. It strengthens competition between developed economies and supports social welfare within developing countries. There has been …

Symposium on Leadership and Entrepreneurial Behavior in Turbulent Times

2014

Pyrolysis-gas chromatography/mass spectrometry of soil organic matter extracted from a Brazilian mangrove and Spanish salt marshes

2009

The soil organic matter (SOM) extracted under different vegetation types from a Brazilian mangrove (Pai Matos Island, São Paulo State) and from three Spanish salt marshes (Betanzos Ría and Corrubedo Natural Parks, Galícia, and the Albufera Natural Park, Valencia) was investigated by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). The chemical variation was larger in SOM from the Spanish marshes than in the SOM of the Brazilian mangroves, possibly because the marshes included sites with both tidal and nontidal variation, whereas the mangrove forest underwent just tidal variation. Thus, plant-derived organic matter was better preserved under permanently anoxic environments. Moreove…

Damping of rotor conical whirl by asymmetric dry friction suspension

2009

Abstract A new technique for the rotor whirl damping in rotating machinery, based on the elastic suspension of the journal boxes and the use of dry friction surfaces normal to the shaft axis between their supports and the frame, is here analysed theoretically for several cases of rotor systems characterized by mass and constraint asymmetry, where gyroscopic effects are to be expected and conical whirl motions may grow up. The critical flexural speeds can be easily cut off by an adhesive state of the supports and the whirl amplitude can be minimized as well throughout the remaining sliding range. Confining the operative angular speed of the rotor in the range of adhesive contact between the …

Gradient-enhanced model and its micromorphic regularization for simulation of Lüders-like bands in shape memory alloys

2018

Abstract Shape memory alloys, notably NiTi, often exhibit softening pseudoelastic response that results in formation and propagation of Luders-like bands upon loading, for instance, in uniaxial tension. A common approach to modelling softening and strain localization is to resort to gradient-enhanced formulations that are capable of restoring well-posedness of the boundary-value problem. This approach is also followed in the present paper by introducing a gradient-enhancement into a simple one-dimensional model of pseudoelasticity. In order to facilitate computational treatment, a micromorphic-type regularization of the gradient-enhanced model is subsequently performed. The formulation empl…

Structural features of selected protic ionic liquids based on a super-strong base

2019

Protic ionic liquids (PIL) were prepared from a super-strong base 1,7-diazabicyclo[5.4.0]undec-7-ene (DBU) and super-strong acids, trifluoromethane sulfonic acid (TfOH), and (trifluoromethanesulfonyl)-(nonafluorobutylsulfonyl)imide, (IM14H), ([DBUH][TfO] and [DBUH][IM14], respectively; the latter for the first time) and their chemical and physical properties and structural features have been explored using a synergy of experimental and computational tools. The short range order in neat DBU, as well as the long range structural correlations induced by charge correlation and hydrogen bonding interactions in the ionic liquids, have been explored under ambient conditions, where these compounds …

Slip Flow Over Structured Surfaces with Entrapped Microbubbles

2008

On hydrophobic surfaces, roughness may lead to a transition to a superhydrophobic state, where gas bubbles at the surface can have a strong impact on a detected slip. We present two-phase lattice Boltzmann simulations of a Couette flow over structured surfaces with attached gas bubbles. Even though the bubbles add slippery surfaces to the channel, they can cause negative slip to appear due to the increased roughness. The simulation method used allows the bubbles to deform due to viscous stresses. We find a decrease of the detected slip with increasing shear rate which is in contrast to some recent experimental results implicating that bubble deformation cannot account for these experiments.…

A new method for generating fully isotropic laminates

2002

In this paper the authors propose some new kinds of isotropic laminates, made with identical anisotropic layers. In particular, these laminates satisfy some conditions which generalise the well-known Werren and Norris rules, in order to obtain fully isotropy, that is, isotropy of the three tensors A, B and D. To this purpose, the authors utilise some results found in a preceding research, namely the so-called quasi-trivial solutions. The way to form particular isotropic laminates that do not follow the Werren and Norris rule is also indicated. The paper ends with some numerical examples which illustrate the theoretical results found.